Characteristics of the three stages of the prevention strategy
| Stage 1 Observation | Stage 2 Analysis | Stage 3 Expertise | |
| When? | All cases | More complicated cases | Very complex cases |
| How? | Qualitative observations | Ordinary measurements | Specialised measurements |
| Cost? | Low | Average | High |
| By whom? | People from the company | Same | Same |
| + Specialists | + Specialists | ||
| + Experts | |||
| Competence: | |||
| Work situation | High | Average | Low |
| Ergonomics | Average | High | Specialised |